economically adv.節(jié)約地，在經(jīng)濟(jì)上
economics n. 經(jīng)濟(jì)學(xué)；經(jīng)濟(jì)
economist n. 經(jīng)濟(jì)學(xué)者,經(jīng)濟(jì)家
economize v. 節(jié)省（錢、時(shí)間等）
economy n.經(jīng)濟(jì)；節(jié)約，節(jié)省
ecosystem n. 生態(tài)系(統(tǒng))
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